Impact of helical grooves on drag force and flow-induced noise of a cylinder under subcritical Reynolds numbers

The drag force and flow-induced noise of underwater vehicles significantly affect their hydrodynamic and stealth performance. This paper investigates the impact of helical grooves on the drag force and flow-induced noise of underwater vehicles through numerical simulations of the flow around cylinde...

Full description

Saved in:
Bibliographic Details
Published in:Physics of fluids (1994) 2024-07, Vol.36 (7)
Main Authors: Xu, Mingyang, Hu, Wulong, Jiang, Zhangze
Format: Article
Language:English
Subjects:
Cylinders
Drag
Drag reduction
Fluid dynamics
Fluid flow
Grooves
Helical flow
Karman vortex street
Large eddy simulation
Noise levels
Noise reduction
Reynolds number
Underwater vehicles
Vortex streets
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The drag force and flow-induced noise of underwater vehicles significantly affect their hydrodynamic and stealth performance. This paper investigates the impact of helical grooves on the drag force and flow-induced noise of underwater vehicles through numerical simulations of the flow around cylinders with two types of helical grooves under various subcritical Reynolds numbers. The simulation scheme employs the large-eddy simulation framework combined with the Lighthill acoustic analogy method. The results show that the helical-groove structure can achieve reductions of up to 30% in drag and 5 dB in noise. These helical grooves have a significant effect in terms of suppressing the formation of a Karman vortex street downstream of the cylinder. Under subcritical Reynolds numbers, the drag-reduction effect of the helically grooved cylinder decreases as the number of helical grooves increases, while the noise-reduction effect increases with increasing number of helical grooves.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0216273